Ubuntu Desktop transition from LightDM to GDM

[Didier Roche]

Le 22/06/2017 à 20:22, Ken VanDine a écrit :
> Ubuntu Desktop will be switching from LightDM to GDM for 17.10.  I'm 
> working on handling that transition and trying to sort out the best 
> solution for upgraders that won't negatively impact other flavors.
>
> The initial plan was to drop the current prompt when configuring the 
> package to select which DM to use by default and just switch current 
> lightdm users to gdm3.  This would only affect users that have both 
> lightdm and gdm3 installed, but I can see cases where users may have 
> that today.   For example an Ubuntu MATE user that has also installed 
> gnome-shell, would have both lightdm and gdm3 installed.  Most of the 
> flavors are using lightdm and as far as I know aren't planning to 
> switch to GDM at this time.
>
> We could use a maintainer script to switch the default to gdm3 on 
> upgrade only if ubuntu-session is installed, this would further reduce 
> the impact.

My heuristic would be for avoiding the prompt:
- ubuntu-session installed
- that session is set as current session for at least one user on the 
machine.

Didier